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The three pictures below - show - 1. the two experimental tanks lit - 2. The 2 tanks with one dark (as explained) - and 3. The original tank from which the sump rock - and the lit rock came today. Hope this helps - The ammonia - by some miracle came today - I will do preliminary measures tomorrow - and then show pictures of before and after ammonia addition. I believe someone requested a day or so of the rock in a tank - before adding ammonia.